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Allseas completes GTA infield pipelay scope

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LNG Industry,

Allseas’ Pioneering Spirit has completed the infield pipelay scope for BP’s ultra-deepwater GTA LNG project offshore Mauritania and Senegal. Two months after arriving in the field, production crew welded, scanned and field joint coated the final piece of pipe for the second 16-in. export gas line.

Safely landed in a 2-m target box at 2400 m water depth, the pipeline will be recovered in J-mode configuration to install the termination assembly. To make this happen, the vessel aft has been fitted with a bespoke J-mode frame with a 1000-t load capacity. It was designed, built, and installed onboard in only eight weeks.

The pipelay scope comprises approximately 75 km of 16-in. export lines and 10 km of 10-in. CRA infield lines, some of the pipeline infrastructure exceeding 2700 m water depth at the deep end. The main firing line and double jointing facilities on Pioneering Spirit have run in parallel throughout the campaign. Pioneering Spirit will conclude the offshore works by installing the six outstanding flowline termination assemblies.

Allseas Project Manager, Laurent Beghin, said: “Our agile approach was key to a quick and efficient start to the project and decision-making process throughout the offshore campaign. Thanks to great collaboration between the onshore and offshore teams, we’ve overcome all challenges faced during the project preparation and execution phases and met all milestones without delay.”

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